Zhang Ke, Xia Jiangbao, Su Li, Gao Fanglei, Cui Qian, Xing Xianshuang, Dong Mingming, Li Chuanrong
Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta, Binzhou University, Binzhou, Shandong, China.
College of Forestry, Shandong Agricultural University, Taian, Shandong, China.
Front Plant Sci. 2023 Mar 31;14:1162013. doi: 10.3389/fpls.2023.1162013. eCollection 2023.
To clarify the effects of microtopography on plant growth and soil water, salt and nutrient characteristics of saline soils in mudflats within muddy coastal zones and explore suitable microtopographic modifications.
Six microtopographic modification patterns, namely, S-shaped, stripe-shaped, pin-shaped, stepshaped, dense stripe-shaped and crescent-shaped patterns, were established in the coastal mudflats of the Yellow River Delta. The soil water, salt, ion, total carbon, total nitrogen, and total phosphorus contents and their ecological stoichiometric characteristics were measured and analyzed after theimplementation of different microtopographic modification patterns, with bare mudflats as the control.
The results showed that microtopographic modification significantly changed the soil water and salt contents and the soil total carbon, total nitrogen and total phosphorus contents. Compared with the bare ground, microtopographic transformation significantly promoted the growth of the pioneer plant , significantly increased the soil water and nutrient contents, and significantly decreased the soil salinity. The soil salinity was mainly reduced by Na and Cl ions. The soil salinity and nutrient contents gradually decreased with increasing soil depth, indicating the occurrence of surface aggregation. Compared to that of the bare ground, the soil C/N was significantly lower and the N/P was significantly higher in the microtopographic treatments, and the overall performance suggested soil N limitation. The ions contained in the saline soil were dominated by Na and Cl, followed by Mg and SO , with lower contents of K, Ca and HCO . Among the six microtopography modification patterns, the crescent-shaped pattern best promoted vegetation restoration. This pattern was the most effective in reducing soil salinity, with a 98.53% reduction in soil salinity compared with that of bare ground, followed by the pin-shaped pattern. Compared with that in the bare ground samples, the nutrient content in the samples from the step-shaped modification increased by 23.27%; finally, the S-shaped, step-shaped and dense stripe-shaped patterns performed poorly in terms of plant restoration and soil improvement.
It is suggested that a crescent-shaped pattern should be considered first when carrying out microtopographic transformation on the beaches of the Yellow River Delta, followed by stripe-shaped and pin-shaped patterns. The dense strip-shaped should not be adopted.
阐明微地形对泥泞海岸带泥滩盐渍土植物生长及土壤水、盐和养分特征的影响，并探索适宜的微地形改造方式。
在黄河三角洲滨海泥滩设置了6种微地形改造模式，即S形、条形、针形、阶梯形、密集条形和月牙形模式。以裸露泥滩为对照，在实施不同微地形改造模式后，测定并分析土壤水、盐、离子、总碳、总氮和总磷含量及其生态化学计量特征。
结果表明，微地形改造显著改变了土壤水盐含量以及土壤总碳、总氮和总磷含量。与裸地相比，微地形改造显著促进了先锋植物生长，显著提高了土壤水分和养分含量，显著降低了土壤盐分。土壤盐分主要通过Na和Cl离子降低。土壤盐分和养分含量随土壤深度增加而逐渐降低，表明发生了表聚现象。与裸地相比，微地形处理下土壤C/N显著降低，N/P显著升高，整体表现为土壤N素限制。盐渍土中所含离子以Na和Cl为主，其次是Mg和SO，K、Ca和HCO含量较低。在6种微地形改造模式中，月牙形模式对植被恢复的促进作用最佳。该模式在降低土壤盐分方面效果最为显著，与裸地相比土壤盐分降低了98.53%，其次是针形模式。与裸地样品相比，阶梯形改造样品中的养分含量增加了23.27%；最后，S形、阶梯形和密集条形模式在植物恢复和土壤改良方面表现较差。
建议在黄河三角洲海滩进行微地形改造时，首先考虑月牙形模式，其次是条形和针形模式，不宜采用密集条形模式。
